import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static void initialize(String s) {
        int c=0;
       for(int i=0;i<s.length();i++)
       {
           for(int j=0;j<s.length();j++)
           {
             if(s.charAt(i)==s.charAt(j))
             {
               c++;break;  
             }
           }
       if(c%2==1)
       {
        c=c-1;   
       }
       }
        System.out.println(c/2);
    
    }
    

    static int answerQuery(int l, int r) {
        // Return the answer for this query modulo 1000000007.
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        initialize(s);
        int q = in.nextInt();
        for(int a0 = 0; a0 < q; a0++){
            int l = in.nextInt();
            int r = in.nextInt();
            int result = answerQuery(l, r);
            System.out.println(result);
        }
        in.close();
    }
}